Bill,
Go to eurotubes.com and purchase a matched pair of JJ E34L. Not EL34,
but E34L. At $24 a pair plus $5-$6 shipping, you are in for tone. I have installed KT88s, 6550s, EL34s, and E34Ls in many a Solarus, Sceptre, 100s, 200s, Sorado, Sonaro, etc... You will not be disappointed. While you are at it, pick up a new ECC83s (12ax7 balanced) and a ECC82 (12au7 balanced).
If you need a NOS 6an8a, I can send you an RCA for $12, including shipping,
USPS priority to USA. Contact me at chuckle@nktelco.net
If you retube with the JJ tubes, you will be happy. Before you invest in KT88s, give the E34Ls a try.
Regards,
Chuck